Rollup merge of #126186 - GuillaumeGomez:migrate-run-make-multiple-emits, r=jieyouxu

Migrate `run-make/multiple-emits` to `rmake.rs`

Part of https://github.com/rust-lang/rust/issues/121876.

r? `@jieyouxu`

src/tools/run-make-support/src/lib.rs

@@ -76,6 +76,11 @@ pub fn htmldocck() -> Command {
     python
 }
 
+/// Returns the path for a local test file.
+pub fn path<P: AsRef<Path>>(p: P) -> PathBuf {
+    cwd().join(p.as_ref())
+}
+
 /// Path to the root rust-lang/rust source checkout.
 pub fn source_root() -> PathBuf {
     env_var("SOURCE_ROOT").into()

src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -144,7 +144,6 @@ run-make/mismatching-target-triples/Makefile
 run-make/missing-crate-dependency/Makefile
 run-make/mixing-libs/Makefile
 run-make/msvc-opt-minsize/Makefile
-run-make/multiple-emits/Makefile
 run-make/native-link-modifier-bundle/Makefile
 run-make/native-link-modifier-verbatim-linker/Makefile
 run-make/native-link-modifier-verbatim-rustc/Makefile